tree c551a4b7588fb105c12c45fad1eec2dddff1541d
parent 3f40f5b2a22110754ce469f5722bade8aeb241e5
author Peter Hurley <peter@hurleysoftware.com> 1415211101 -0500
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1415314647 -0800

tty: Allow safe access to termios for set_ldisc() handlers

Allow a tty driver to safely access termios settings while handling
the set_ldisc() notification. UART drivers use the set_ldisc()
notification to check if the N_PPS line discipline is being enabled;
if so, modem status interrupts may also need to be enabled. Conversely,
modem status interrupts may need to be disabled if switching away
from the N_PPS line discipline.

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>